BIO 181 ASU EXAM QUESTIONS AND
CORRECT ANSWERS/ 2026/2027
UPDATED
List ithe i4 itypes iof iglial icells iand ilist ia iphrase ito idescribe itheir ifunction. i- i1. iSchwann
icells iwrap iaround ithe iaxon iof ia icell iin ithe iPNS, iwhile iproviding ielectrical iinsulation.
2. iOligodendrocytes ido ithe isame ithing ias iSchwann icells ibut ithey ido iit iin ithe iCNS.
3. iAstrocytes iprotect ithe ibrain ifrom itoxic ichemicals.
4. iMicrogilia iprotect ithe ibrain.
T/F iWhen ithe ipresynaptic icells icontacts ia imuscle icell, ithe isynapse iarea iis icalled ia
imotor iend iplate. i- iTrue
T/F iThe iautonomic inervous isystem icontains ithe isympathetic iand ithe iparasympathetic
inervous isystem. i- iTrue
T/F iVoltage-gated iion ichannels iopen iwhen ia iprotein ibinds ito ithe ireceptor. i- iFalse
T/F iThe ireceptors iin ipost-synaptic icells iare ithe ibasis ion iwhich ithe isynapse ican ibe
idefined ias iinhibitory ior iexcitatory. i- iFalse
Briefly iexplain iwhy ithe iaction ipotential iflows ionly ifrom ithe iaxon ihillock ito ithe iterminal
iweb. i- iThe iaction ipotential ioriginates ifrom ithe iaxon ihillock iwhich iinitiates ithe iflow iof
ithe iaction ipotential ibecause iof ithe ipresence iof ihigher idensity ivoltage-gated iion
ichannels.
T/F iFast ineurons ias idescribed iin ilecture irequire icytoplasmic isignal itransduction ito
iopen ian iion ichannel. i- iFalse
T/F iPotassium iions iare iat ihigh iconcentrations iinside iof icells iincluding iin ineurons. i-
iTrue
In ithe imotor iend iplate, ithe ievent ithat iis ithe iimmediate itrigger ifor iexocytosis iis:
- iPotassium iIons
- iChloride iions.
- iThe iaction ipotential.
- iThe icell ibody. i- iCalcium iions.
T/F iExcitatory isynapses imake ithe ipost-synaptic icell iless ilikely ito ifire. i- iFalse
, T/F iAcetylcholine iexocytosed ifrom ithe ipresynaptic icell itravels ito ithe ipostsynaptic icell
ito istart ithe iaction ipotential iin ithe ipostsynaptic icell. i- iTrue
The ipost-synaptic icell ican ibe:
- iin iglands, imuscle icells, ineurons.
- iare ionly ineurons.
- ihave ionly ichemical isynapses.
- ihave ionly ielectrical isynapses.
- ithis ilist icontains ino icorrect ianswers. i- iin iglands, imuscle icells, ineurons.
The iresting ipotential iof ineurons iis:
- i0 imV
- isame ias ithe iaction ipotential.
- ialways ia ipositive ivalue.
- itwo iof ithe iabove.
- ithe ianswer iis inot ion ithis ilist. i- iThe ianswer iis inot ion ithis ilist
T/F iThe iaxon ifrom ia ipre-synaptic icell icontacts ithe iaxon iof ianother ineuron. i- iFalse
T/F iFast ineurons ias idescribed iin ilecture iare ifast ibecause ithey iare isurrounded iby ia
itype iof iglial icell ithat iresults iin ia imyelin icoating. i- iFalse
The ineural itissues iare:
- ispinal icord, isensory ineurons, iand icell ibody
- ispinal icord, isensory ineurons, iand ibrain
- ipituitary iand ihypothalamus
- inone iof ithe iabove i- ispinal icord, isensory ineurons iand ibrain
The icentral inervous isystem i(CNS) icontains:
- inerves iextending ifrom ithe ispinal icolumn ito ithe ifingers
- imotor ineurons iextending ifrom ithe ispinal icolumn ito ithe ifingers.
- ionly ithe ibrain
- itwo iof ithe iabove
- ithere iis ino icorrect ianswer i- ithere iis ino icorrect ianswer
T/F iReceptors iare imade ifrom imembrane-bound ipolyribosomes. i- iTrue
T/F iThe imembrane ipotential i(resting ipotential) iis ilargely iset iby ithe iNa-K- iATPase
ipump. i- iTrue
T/F iExcitatory isynapses icause idepolarization iof ithe ipost-synaptic icell. i- iTrue
T/F iOnly ipre-synaptic ineurons iare icoated iwith imyelin. i- iFalse
T/F iThe iaxon ihillock iin ithe ipre-synaptic ineuron ifires ibased ion itemporal iand ispatial
isummation iof iinputs. i- iTrue
CORRECT ANSWERS/ 2026/2027
UPDATED
List ithe i4 itypes iof iglial icells iand ilist ia iphrase ito idescribe itheir ifunction. i- i1. iSchwann
icells iwrap iaround ithe iaxon iof ia icell iin ithe iPNS, iwhile iproviding ielectrical iinsulation.
2. iOligodendrocytes ido ithe isame ithing ias iSchwann icells ibut ithey ido iit iin ithe iCNS.
3. iAstrocytes iprotect ithe ibrain ifrom itoxic ichemicals.
4. iMicrogilia iprotect ithe ibrain.
T/F iWhen ithe ipresynaptic icells icontacts ia imuscle icell, ithe isynapse iarea iis icalled ia
imotor iend iplate. i- iTrue
T/F iThe iautonomic inervous isystem icontains ithe isympathetic iand ithe iparasympathetic
inervous isystem. i- iTrue
T/F iVoltage-gated iion ichannels iopen iwhen ia iprotein ibinds ito ithe ireceptor. i- iFalse
T/F iThe ireceptors iin ipost-synaptic icells iare ithe ibasis ion iwhich ithe isynapse ican ibe
idefined ias iinhibitory ior iexcitatory. i- iFalse
Briefly iexplain iwhy ithe iaction ipotential iflows ionly ifrom ithe iaxon ihillock ito ithe iterminal
iweb. i- iThe iaction ipotential ioriginates ifrom ithe iaxon ihillock iwhich iinitiates ithe iflow iof
ithe iaction ipotential ibecause iof ithe ipresence iof ihigher idensity ivoltage-gated iion
ichannels.
T/F iFast ineurons ias idescribed iin ilecture irequire icytoplasmic isignal itransduction ito
iopen ian iion ichannel. i- iFalse
T/F iPotassium iions iare iat ihigh iconcentrations iinside iof icells iincluding iin ineurons. i-
iTrue
In ithe imotor iend iplate, ithe ievent ithat iis ithe iimmediate itrigger ifor iexocytosis iis:
- iPotassium iIons
- iChloride iions.
- iThe iaction ipotential.
- iThe icell ibody. i- iCalcium iions.
T/F iExcitatory isynapses imake ithe ipost-synaptic icell iless ilikely ito ifire. i- iFalse
, T/F iAcetylcholine iexocytosed ifrom ithe ipresynaptic icell itravels ito ithe ipostsynaptic icell
ito istart ithe iaction ipotential iin ithe ipostsynaptic icell. i- iTrue
The ipost-synaptic icell ican ibe:
- iin iglands, imuscle icells, ineurons.
- iare ionly ineurons.
- ihave ionly ichemical isynapses.
- ihave ionly ielectrical isynapses.
- ithis ilist icontains ino icorrect ianswers. i- iin iglands, imuscle icells, ineurons.
The iresting ipotential iof ineurons iis:
- i0 imV
- isame ias ithe iaction ipotential.
- ialways ia ipositive ivalue.
- itwo iof ithe iabove.
- ithe ianswer iis inot ion ithis ilist. i- iThe ianswer iis inot ion ithis ilist
T/F iThe iaxon ifrom ia ipre-synaptic icell icontacts ithe iaxon iof ianother ineuron. i- iFalse
T/F iFast ineurons ias idescribed iin ilecture iare ifast ibecause ithey iare isurrounded iby ia
itype iof iglial icell ithat iresults iin ia imyelin icoating. i- iFalse
The ineural itissues iare:
- ispinal icord, isensory ineurons, iand icell ibody
- ispinal icord, isensory ineurons, iand ibrain
- ipituitary iand ihypothalamus
- inone iof ithe iabove i- ispinal icord, isensory ineurons iand ibrain
The icentral inervous isystem i(CNS) icontains:
- inerves iextending ifrom ithe ispinal icolumn ito ithe ifingers
- imotor ineurons iextending ifrom ithe ispinal icolumn ito ithe ifingers.
- ionly ithe ibrain
- itwo iof ithe iabove
- ithere iis ino icorrect ianswer i- ithere iis ino icorrect ianswer
T/F iReceptors iare imade ifrom imembrane-bound ipolyribosomes. i- iTrue
T/F iThe imembrane ipotential i(resting ipotential) iis ilargely iset iby ithe iNa-K- iATPase
ipump. i- iTrue
T/F iExcitatory isynapses icause idepolarization iof ithe ipost-synaptic icell. i- iTrue
T/F iOnly ipre-synaptic ineurons iare icoated iwith imyelin. i- iFalse
T/F iThe iaxon ihillock iin ithe ipre-synaptic ineuron ifires ibased ion itemporal iand ispatial
isummation iof iinputs. i- iTrue
